/*******************************************************************************
 * Copyright 2011 Alexandre Zglav and Morphiastic
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package com.morphiastic.analysis.analyzers;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;

import com.morphiastic.analysis.AnalysisComponentDefinition;
import com.morphiastic.utils.EqualsUtil;

public class StopAnalyzer extends ElasticAnalyzer {

	
	public static final String STOPWORDS_SEPARATOR = ",";
	public static final String STOPWORDS_PARAM_KEY = "stopwords";
	public static final String STOPWORDS_PATH_PARAM_KEY = "stopwords_path";
	
	
	
	private Set<String> stopwords;
	private String stopWordsPath;
	
	
	public StopAnalyzer(String defName) {
		this(null, defName);
	}
	
	
	public StopAnalyzer(Map<String,String> params, String defName) {
		super(ElasticAnalyzerType.stop, defName);
		if(params!=null){
			String stopwStr = params.get(STOPWORDS_PARAM_KEY);
			if(stopwStr!=null && !stopwStr.isEmpty()){
				this.stopwords=new HashSet<String>();
				String[] stopwds = stopwStr.split(STOPWORDS_SEPARATOR);
				for (String stopw : stopwds) {
					this.stopwords.add(stopw.trim());
				}
			}
			this.stopWordsPath = params.get(STOPWORDS_PATH_PARAM_KEY); 
		}
	}
		
		
	@Override
	public boolean hasCustomParams() {
		 if(this.stopwords!= null || (this.stopWordsPath!=null && !this.stopWordsPath.isEmpty()) )return true;
		 return false;
	}

	
	@Override
	public XContentBuilder addToBuilder(XContentBuilder mappingBuilder) throws IOException {
		mappingBuilder.startObject(getDefinitionName())
		.field("type", getComponentSubTypeName());
		
		//add custom params
		if(this.stopwords!=null){
			List<String> stopWrdsList = new ArrayList<String>(this.stopwords);
			mappingBuilder.field(STOPWORDS_PARAM_KEY, stopWrdsList);
		}
		if(this.stopWordsPath != null && !this.stopWordsPath.isEmpty()){
			mappingBuilder.field(STOPWORDS_PATH_PARAM_KEY, this.stopWordsPath);
		}
		return mappingBuilder;
	}
	
	
	
	@Override
	public void setParamsFromSettings(Settings analyzerSettings) {
		//STOP WORDS SETTINGS
		Settings stopWordsSettings = analyzerSettings.getByPrefix("stopwords.");
		if (stopWordsSettings.getAsMap().size()>0)this.stopwords = new HashSet<String>();
		for (Entry<String, String> stopWordSetting : stopWordsSettings.getAsMap().entrySet()) {
			this.stopwords.add(stopWordSetting.getValue());
		}
		
		String stopWordsPathSetting = analyzerSettings.get(STOPWORDS_PATH_PARAM_KEY);
		if(stopWordsPathSetting!=null && !stopWordsPathSetting.isEmpty()){
			this.stopWordsPath = stopWordsPathSetting;
		}
	}

	
	
	@Override
	public boolean areEquivalentDefinitions(AnalysisComponentDefinition otherAnalyzer){
		
		if(otherAnalyzer==null)return false;
		StopAnalyzer otherStopAnalyzer ;
		try {
			otherStopAnalyzer = (StopAnalyzer)otherAnalyzer;
		} catch (ClassCastException e) {
			return false;
		}
		
		return 
		EqualsUtil.areEqual(this.stopwords, otherStopAnalyzer.stopwords)
		&&
		EqualsUtil.areEqual(this.stopWordsPath, otherStopAnalyzer.stopWordsPath);
		
	}
		

	
}
